Abstract
The microstructures of human Sartorius muscles were investigated using a transmission electron microscope (TEM). The TEM microstructures of continuity and repeat of the myosin and the actin, and about ten nanometer-sized myofibrils were observed. A higher magnification of the myosin and the actin structures of the subjects who used to take exercise almost everyday revealed spiral structures of myosin and actin showing myosin-head like structures.
